Electricity meter



Sept. 9. 1924. 1,508,088 5. Z. DE FERRANTI ET AL v ELECTRI CITY METERFiled Jan. 21. 1921 "3 Sheets-Sheet 1 Sept. 9 1924.

. 1,508,088 8. Z. DE FERRANTI ET AL ELECTRICITY METER Filed Jan.

3 Sheets-Sheet 2 Ill/0611210136 Z- 'anzm'b G. ZIZa/L& WM

J'bT/y Sept. 9 1924.

5. Z. DE FERRANTL ET AL .ELWQRI CITY METER 3 Sheets-Sheet 5 Filed Jan.21 1921 Patented Sept. 9, 1924.

UNlTE lit SEBASTIAN ZIANI DE FER-RANT]: AND GEORGE WALL, OF HOLLINWQOD,ENGLANDv ASSIGNOBS TO FEBBANTI LIMITED, OF HOLLINWOOD, ENGLAND.

ELECTRICITY METER.

Application filed January 21, 1921. Serial No.439,008.

To all whom it may concern.

Be it known that we, SEBASTIAN ZIANI DE FERRANTI and GEORGE WALL, bothsubjects of the King of Great Britain and Ireland, and both residing atHollinwood, in the county of Lancaster, England, have invented certainnew and useful Improvements Relating to Electricity Meters (for which wehave filed an application in England January-17, 1920, Patent No.165,133), of which the following is a specification.

This invention relates to the adjustment of electrical instrumentsincluding, for instance, integrating meters, indicating instruments andrelays, and has for its object to provide simple and predeterminedadjusting devices therefor.

The features of our invention which we consider novel and patentable aredefinitely pointed out in the claims appended hereto.

Referring to the accompanying diagrammatic drawings:

Figures 1 and 2 indicate front and side views respectively of aninduction integrat ing electricity meter in which are provided separatelow load, full load and inductive load adjustments according to thepresent invention.

Figures 3 and 4 are similar views of a portion of a similar meterprovided with modified full load and inductive load adjustments.

Figures 5 and 5 represent details of a modified low load adjustment. f

Fig. 6 is a vertical section on the line 66 of Fig. 1.

In carrying the invention into effect in one form illustrated by way ofexample in Figures 1 and 2 as applied to the usual adjustments desirablein an alternating current induction motor meter, we mount the serieselectromagnet a upon a hinged piece I) for the purpose of effectingadjustment of the full load speed. I

The heel of the hinged piece is provided with a nut 0, into which ascrew d is fitted enabling the hinged piece to be rocked upon rotationof the screw. Beneath the screw head and between the heel and metercasing is placed a strong compression spring 5 so that the hinged piecemay be held rigidly in any position determined by that of the screw d.

The act of turning the screw is thus to move the series electromagnet afarther from or nearer to the shunt electromagnet 6, thereby decreasingor increasing respectively the rotor speed. w I Alternatively, the fullload speed maybe adjusted by the movement between the retardingpermanent magnets f of a piece of magnetic material 9, say mild steel,(see Figures 3 and 4). Conveniently this magnetic material 9 is formedof flat section and is mounted in bearings it carried by the permanentmagnets, and at one end carries'a projecting arm iof spring steel whichitself is provided with a handle j. Beneath this handle is a peg whichis capable of engaging in any one of a series of holes formed in thepath of movement thereof.

This magnetic piece 9' is situated between the two permanent magnets fand by varying the position in which the handle is placed, so the totalretarding efi'ect of the permanent magnets is varied.

The positions of the holes Zc are such as to give, say, 1% adjustmentfrom one hole to the next, the holes being, of course, formed in asuitable plate Z fitted between the permanent magnets.

The spaces between the holes 76 will be. found to be non-uniform, beingwidest apart when the fiat magnetic piece 9 is approximately parallel tothe adjacent limbs of the permanent magnets and being closest together'when this magnetic piece is at right angles. I

As regards the low loadadjustment, we use a piece of magnetic material 8carriedv pivotal-1y upon the centre limb of-the shunt electromagnet c(Figure 1). This member is provided with a spring arm 23 carrying thehandle at and peg capable of engaging any of a series of holes 4) in aconvenient part of the meter casing. direction causing the magneticpiece to move away from its central or symmetrical position effectsincrease in low load speed for a, given direction of rotation, andmovement of the lever in the reverse direction will effect a decrease inlow'load speed for the same direction of rotation. Alternatively we mayfix a'magnetic piece m, say of mild steel (see Figure 5), to "anon-magnetic slide Movement of this arm in a bar awhich is adapted to bemoved laterally in relation to the shunt electromagnet c. This magneticpiece m is pressed into contact with the centre limb of the shunt magnetby means of small compression springs 0 (Fig- The slide is adapted to bemoved by means of a'screw p fitted-to the meter frame and carryingan'eccentric portion engaging a slotprovided in the cranked end of theslide. This operating screw carries a small pointer q and a scale rmounted upon the slide serves to indicate the position in which thescrew rests.

The magnetic piece m is thus capable 0 being moved towards or awayfromdts central or symmetrical positionby partialrotation of the screw29.

Upon the scale-r are graduationsso placed mutually as to give equalpercentage adjustment between consecutivemarks.

As regardsadjustment tor-inductive load, we conductor-:preiierably inthe form of acopperstamping to (as indicated-in Fig ure 1) to acranlredslide piece :12, the stamp.- ing' surrounding the lower portion of theshunt -magnet core. The crankedislide :is provided withslots-g engaging;pins 2. litted to the meter casing, compression springs (not shown)fitted beneath washers 6-.(Figure 1) being'carriedon tllGS(:Pll1Sg2Li1(l adapted to press the-slide-firmlya against suitablesurfaces on the meter casing At the lower end of theslide a slot 1 isprovided with which an eccentric-screw 2 engages. Tliis'eccentrio screwoperates the slide in a manner exactly'simi lar tothatdescribed withreference to the low load adjustment indicated in Figures;- 5- and 5, asimilar scale and pointer being provided in this case also.v

In operation upon turning" the;scr'ew 2 in one "direction thesli'derrcois li'fted-and the cranked end carrying the "copper stampingwmoved upwards in relation to the shunt magnet c. This upward movementof the copper stamping increases the speed on inductive load.

Movement of thex-screw in the reverse direction causes an oppositeeffect.

Alternatively asindicated in Figures 3 and we may" carry the-coppel:stamping 1w upon a spri-ng'leveinfi pivoted to they-meter cas" thespring leverinthiscaseais; provided with a" knobil" and peg, the latterengaging any hole of the-series formed in: a suitable part of the; metercasing.

The retarding magnets are so; disposed in relation toeach other. a-ndtothe rotor disc as to give maximum;brakingeflect; We are thus enabled touse amin-imum; quantity of steel for the desired speed of; rotation.

It will be appreciated that by means of the adjustments according tothe-present in ventionthe operation of" calibrating: the

1,eos,oss

meter. is greatly simplified; e. g. assuming a meter has been tested andfound to read 3% slow, then it is merely necessary to move thecorresponding" adjustment 3% in the opposite or' fast direction when asubstantially correctly reading meter is attained without the necessityfor retesting.

Having now particularly described and ascertained the nature of our saidinvention and in what manner the sameisto be per formed we declare thatwhat we claim is 2-- 1. An electricity meter including a movable-rotor,element; :a series electro-ma'gnet coil on one-side thereof athree-limbed mane neticcore on the other side thereof a shunt coil on;the centre limb oi said magnet core a movable magnetic pole piecemounted adjacent said centre limb, and mean for mo"- ingsaid movablepole piece across the field. thus effecting dis flacement of the magnetc field distribution as desired.

An electricity meter including a movable rOtQr'clement, a serieselectro-magnet coil on one sidethereot a three-limbed mag:- netic coreonthe other side thereof, a shunt coil on the centre limb otsaid magneticcore a movable magnetic pole piece pivoted upon said centre-limb, andmeans for rocking; said movable pole piece laterally in the field, thuseffecting displacement of the magnetic field distribution as desired.

3. An electricity meter including a movable rotor element, a serieselectro-mac'net coil. on one side thereof, a threedimbed maginetic coreon the other side thereof. a shunt coil on the centrelimb of saidmagnetic core. a movable magnetic pole piece mounted upon a roclrabilearm pivoted upon said cen-r limb, and an indicating;scale-co-acting u ansaid arm.

4:. Means for adjusting the full loar ting ofian electrical instrumentincludi movable electro-mag'net.mounted in p onimity' to arotatable'conducting member, and means for rocking said electro-magnetabout ai-fixed axis in a direction substantially at rightangles to theplane of the conducting member.

Ben: electricity meter including a morable rotor element series currentelectrd magnet core supporting means for said core incorporating acarrying lug-and a projecting lug a fixed supporting lug. pivotal meansconnecting said supporting lu saidcarrying hip; and manually adju meanscoasting with 'saidprojectingr hie t efl'ect rocking of said supportingmeans.

In testimony whereof we have signed our names to this specification.

SEBASTiAl l ZiAlllde FERRAlZTi. GEGRGE WALL.

